The problem here is that the files being include like: .class, .inc, .check are working, but the other ones (.rdf, .error) that are called directly from the URL doesn't get recognized by Apache, where i get an "Internal Server Error" error.

You got it Redcircle But i won't do it... not again...!
I already did what you said ruturajv, don't remember now with what i came up, but i know... it didn´t helped.
But now it's seems i shoud check it again... to make sure!